Improvement in sewer-traps



A. ELY.

` SEWER-TRAP.

' Patented Fe'b.22,1875

NITED i STATES PATENT OFFICE.

ANDREW ELY, OF ROCHESTER, NEW YORK, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THERESIA ELY, OF SAME PLACE.

IMPROVEMENT IN SEWER-TRAPS.

Specification forming part of Letters Patent No. 173,925, dated February22, 1876; application tiled Y January 24, 1876.

Y To all whom t `may concern:

' reference being had tol the accompanying drawings, in which- Figure l is a perspective view of the case or shell. Fig. 2 is a similar view of the completed trap. Fig. 3 is a vertical section. Fig. 4 is a top view. p

Ordinary sewertraps have a water-cup at the bottom, into which shuts a valve or trunk to cut oftl the stench and prevent its upward passage. My improvement differs from these in having a dry chamber at the bottom, with a valve that shuts closely thereto by its own gravity. The filling of dirt into the bottom of this chamber makes the same gas-tight, and when water ows therein the valve opens automatically, allowing it to escape, but always leaving the chamber dry.

The invention consists in a particular construction of the case or shell of the trap, whereby it is adapted to receive the valve, as hereinafter more fully described.-

A represents the vcasing or shell, which is usually made of cast-iron. The upper portion of the case is square in cross-section, as shown at a, having a flange at the top which fits the curbing in which the trap is placed.' It is covered by the usual grating to prevent the entrance of stones and other obstructions. The back b is made inclined from the bottom to about'two-thirds the distance up to direct the water forward against the valve. On the front side, about half-way up, is an angular shelf, o, extending inward, which leaves a sunken seat, d, in which rests the valve. The lower end of the case is on a plane with the vertical front side, which leaves the sunken seat d inclined, by which means the valve will shut of its own B is the valve.

point at the bottom, by which means the dirt 1 entering settles at the apex and quickly seals the joint at the valve. The inclined shelf c projects over the upper edge of the valve, so as to throw oft' the dirt and preventit obstructing and sticking the valve, which it would do if the hinge were uncovered. The

inclined sunken portion d forms a seat for the' valve, which is situated at such an angle as to shut by its own weight, but yet open when Water gathers upon the inside. The angle of the valve, approximating that of the back of the case, leaves a very thin wedge-space for the dirt to gather in, so that the trap will pack in a very short time after a rain. This angle is such, also, as to insure the ready passage of sticks, 85o., which, in going down, necessarily pass endwise, being directed by the incline, and have a ready exit.

I have found, from practical use, that this trap is quite as elfectle in shutting off stench as a water-trap, While ,it obviates the great difficulty of freezing, which occurs where Water is left standing in the trap.

What I claim as new isl. The case A, constructed with the square top a, inclined back b, angular shelf c, and inclined sunken seat d, for the fitting ofthe valve B, as shown and described, and for the purpose specified. v

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses. j

ANDREW ELY.

Witnesses:

WM. T. MOORE, R. F. OsGooD. 

